The Thylacine (Thylacinus cynocephalus) is a large carnivorous marsupial native to Australia, which is thought to have become extinct in the 20th century. It is also known as the Tasmanian Tiger, Tasmanian Wolf, Marsupial Wolf, and the Tassie (or Tazzy) Tiger or simply the Tiger. It was the only member of its genus, Thylacinidae, although a number of related species have been found in the fossil record dating back to the early Miocene.
The Thylacine was extinct on the Australian mainland...

A pivoted catch designed to fall into a notch on a ratchet wheel so as to allow movement in only one direction (e.g. on a windlass or in a clock mechanism), or alternatively to move the wheel in one direction.